RUBBER , VULCANIZED OR THERMOPLASTIC - DETERMINATION OF AGEING CHARACTERISTICS BY MEASUREMENT OF STRESS RELAXATION IN TENSION (FIRST REVISION) (ISO 6914:2008, IDT)
This Malaysian Standard describes three methods for the measurement of the change of stress in test piece at given elongation for the purpose of determining the ageing characteristics of a rubber.
- Method A is intended for measurement under continous strain conditions.
- Method B is the preferred method for measurement under intermittent conditions.
In the case of both methodsA and B, a stress relaxometer is used to record the stress at the temperature of ageing.
Method C is an alternative to method B for measurement under intermittent strain conditions in which the test piece is removed from the ageing environment for measurement of the stress at standard laboratory temperature.
The necessary calibration schedule for this type of measurement is given in AnnexA.Measurements at a single elevated ageing temperature can be used for quality control purposes as a measureof heat-ageing resistance. Measurements at a number of temperatures can be used for research anddevelopment purpo
